Among the things that angels are offended from are offensive smells and by filth and dirt.

The Messenger of Allah (sal Allahu alaihi wa sallam) said: “Anyone who eats garlic and onions or leeks should not come near our Masjid. The angels are harmed by what harms the sons of Adam.” [Sahih Muslim]

iv. The prohibition on spitting to the right while praying

Anas b. Malik reported: The Messenger of Allah (may peace be upon him) said: When any one of you is engaged in prayer, he is holding intimate conversation with his Lord, so none of you must spit in front of him, or towards his right side, but towards his left side under his foot.

v. Befriending all the angels

The Muslim has to like all the angels without any discrimination between one angel and another. They are all slaves of Allah that do what is commanded .

The Jews claimed they had friends and enemies among the angels; Jibrael their enemy and Mikael was their friend.

Al Baqarah 2: 97-98

Say (O Muhammad Peace be upon him ): “Whoever is an enemy to Jibrael (Gabriel) (let him die in his fury), for indeed he has brought it (this Qur’ân) down to your heart by Allâh’s Permission, confirming what came before it [i.e. the Taurât (Torah) and the Injeel (Gospel)] and guidance and glad tidings for the believers. (97) “Whoever is an enemy to Allâh, His Angels, His Messengers, Jibrael (Gabriel) and Mikael (Michael), then verily, Allâh is an enemy to the disbelievers.” (98)

The Jews claimed that Jibreel is their enemy because he comes with war and destruction, and if the one who had come to the Messenger sallallahu alaihi wasalam had been Mikaeel, they would have followed him.

In shirk al Asmaa as Sifaat, Allah is given the form and qualities of human being or animals. The image of God is often painted, moulded or carved in the shape of human. Usually in the physical feature oft those who are worshiping them.

For example Hindus and Buddhists worship idols that have the likeness of Asian man or woman and consider them the manifestation of God in creation.

Some Christian painters such as Michaelangelo have drawn God looking like an European man with long white hair and beard and is plastered on thec ceiling of the Sistine Chapel in vatican.

2. Shirk by Deification

In this shirk, Allah’s names and attributes are given to creation.

For example the Shiite sects in teh Nusayreeyah of Syria believed that Ali bin Abu talib was a manifestation of Allah and they gave him many qualities of Allah.

There’s a teaching called Ismails also known as Agha Khanis whose leader is called Agha Khan. they believed that their leader is God incarnated.

The Druze of Lebanon believed that the Faatimid Caliph al Haakim bi Amrillah was teh last manifestation of Allah among mankind.

Some Sufis like al Hallaj believe that they have become one with God

Taken from – The fundamentals of Tawheed by Abu Ameenah Bilal Phillips